Creating a customized Likert scale Survey

I suggest you use just one number variable to capture the choice made on each question. That way, each button can have a trigger that sets that variable to the appropriate number. 

If you need to keep a running score, I suggest you add a "Submit my choice" button. Put the trigger to add the choice variable to the Total variable on that button. Note: If you do this, that button also needs to do something to prevent the user from submitting a new answer to the same question. Otherwise, the total will be off.

To make it easier on yourself, I suggest you don't add up the choices from each question until you get to the slide where you'll be giving feedback. 

This post has a demo file about tracking answers from custom surveys. You might find it helpful. TIP: Track Responses to Custom Questions or Surveys | Articulate - Community